Ctrl, opt,shift arrow down for mac on normal keyboard

https://www.amazon.com/dp/B00B7GV802?

Windows Win key = Mac CMD key or ⌘ 

Windows alt key = Mac Option key or ⌥, also called alt key on Mac sometimes.

I'm having software problems in my MacBoo… - Apple Community

Please explain why you are having a problem doing that, and what the purpose of this shortcut is.

And specifically what you mean by a "normal keyboard".